<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
    </head>
    <body>
        <div id="test"></div>

        <!-- 这里全部更改为17.0.1版本的react -->
        <script crossorigin src="https://unpkg.com/react@17.0.1/umd/react.development.js"></script>
        <script crossorigin src="https://unpkg.com/react-dom@17.0.1/umd/react-dom.development.js"></script>
        <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
        <script type="text/babel">
            class Time extends React.Component{
                state={
                    date : new Date()
                }
                componentDidMount(){
                    setInterval(()=>{
                        this.setState({date:new Date()})
                    },1000)
                }
                render(){
                    return(
                        <div>
                            <h1>Hello,React</h1>
                            <input type="text"/>
                            <span>
                                现在是:{this.state.date.toTimeString()}
                                <input type="text" name="" id=""/>
                            </span>
                        </div>
                    )
                }
            }
            ReactDOM.render(<Time/>,document.getElementById("test"));
        </script>
    </body>
</html>